The Girls star, 29, debuted her new bling — which she wears on her right hand, not her left — via Instagram. "Early anniversary gift from boyfriend of the year @jackantonoff (care of @eriebasin in Brooklyn,)" she wrote of the delicate sparkler.

The vintage accessory features a narrow gold band with smaller green and gold colored gems surrounding a larger center stone. "Turn of the century moonstone and peridot," Dunham said of the unique piece. "I will so enjoy looking at it while I type words."

Dunham previously declared that she and the Bleachers frontman, 32, who have been dating since 2013, wouldn't get hitched until LGBT marriage was legal in all 50 states.

"The idea of having a celebration that can't be fully shared among all the people in my life and all the people that we love just doesn't really feel like a celebration at all," the HBO series creator told Ellen DeGeneres in May 2015. "So until that's something that everyone can join into with no sense of being left out on any level, politically, emotionally, it's just not something that we're gonna do."